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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b215bf9030f710df3641cc610dd6d1571a4bd2b8a1d1a214c04f52d82f82e0ab' 
  AND token = 'BxqE+9uYi8jK6QjJ+D0rb881CcVcTbY8T81OH0Ghi0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}